In synonymy:
Atrophonysia Benoit & Legendre, 1968 = Idioctis L. Koch, 1874 (Raven, 1985a: 113)

type Idioctis helva L. Koch, 1874; gender feminine

N.B.: considered a senior synonym of Atrophonysia Benoit & Legendre, 1968: 330 [urn:lsid:nmbe.ch:spidergen:04967] (type A. intertidalis Benoit & Legendre, 1968) by Raven, 1985a: 113.

Transferred to other genera:
Idioctis hawaiiensis Raven, 1988 -- see Nihoa
Idioctis ornata Rainbow, 1914 -- see Arbanitis
Idioctis palmarum Hogg, 1901 -- see Ozicrypta
Idioctis papuensis Rainbow, 1920 -- see Arbanitis
Idioctis sierramadrensis Barrion & Litsinger, 1995 -- see Rhianodes
Idioctis sordida (Rainbow, 1898) -- see Nihoa

Idioctis eniwetok Raven, 1988: 12, f. 37-47 (Dmf).

Idioctis ferrophila Churchill & Raven, 1992: 17, f. 11a-d, 12a-g (Df).

Idioctis helva L. Koch, 1874a: 484, pl. 37, f. 3 (Df).
Idioctis helva Raven, 1988: 3, f. 1-5 (f).
Idioctis helva Churchill & Raven, 1992: 11, f. 3a-d, 5a-j, 6a-g (f, Dm).
Idioctis helva Raven, 1994: 304, f. 4C.

Atrophonysia intertidalis Benoit & Legendre, 1968: 331, f. 1-5 (Df).
Atrophonysia intertidalis Benoit, 1978c: 408, f. 2A (f).
Idioctis intertidalis Raven, 1988: 8, f. 20-25 (f).
Idioctis intertidalis Saaristo, 2010: 25, f. 1.7-12 (f).
Idioctis intertidalis Gonzalez-Filho et al., 2024: 684, f. 11A-D (f habitus).

Idioctis littoralis Abraham, 1924: 1098, pl. 2, f. 8-9 (Df).
Idioctis littoralis Raven, 1988: 8, f. 26-30 (f).
Idioctis littoralis Raven, 1994: 313, f. 12N, 13J-K, T.

Idioctis marovo Churchill & Raven, 1992: 21, f. 17a-f, 18a-f (Df).

Idioctis parilarilao Yu et al., 2023d: 244, f. 4A-J, 5A-C, 6A-F (Dmf).

Idioctis talofa Churchill & Raven, 1992: 19, f. 14a-c, 15a-h (Df).

Idioctis xmas Raven, 1988: 10, f. 31-36 (Df).

Idioctis yerlata Churchill & Raven, 1992: 14, f. 1, 8a-f, 9a-g (Df).